Hairbrush



FIG. 1 is a bottom plan view of a hairbrush, showing my new design;

FIG. 2 is a left end elevational view thereof;

FIG. 3 is a right end elevational view thereof;

FIG. 4 is a right side elevational view, the left side being a mirrorimage thereof;

FIG. 5 is a top plan view thereof.

The ornamental design for a hairbrush, as shown and described. 